108[277]HsHassium
Hassium (Hs) — element 108transition metal · group 8, period 7
Hassium is a chemical element with the symbol Hs and atomic number 108. It is a transition metal in group 8, period 7 of the periodic table (the d-block), with a standard atomic mass of [277] u. At room temperature (25 °C) hassium is predicted to be of unknown state.
💡 Known for: Named after the German state of Hesse, where it was first made.
# Hassium properties
| Symbol | Hs |
|---|---|
| Atomic number | 108 |
| Atomic mass | [277] u |
| Category | transition metal |
| Group | 8 |
| Period | 7 |
| Block | d-block |
| Electron configuration | [Rn] 5f¹⁴ 6d⁶ 7s² |
| Full configuration | 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f¹⁴ 5s² 5p⁶ 5d¹⁰ 5f¹⁴ 6s² 6p⁶ 6d⁶ 7s² |
| Electrons per shell | 2, 8, 18, 32, 32, 14, 2 |
| Protons / electrons | 108 / 108 |
| State at 25 °C | unknown |
| Melting point | unknown |
| Boiling point | unknown |
| Density | 40.7 g/cm³ (predicted) |
| Electronegativity (Pauling) | — |
| First ionization energy | — |
| Atomic radius | — |
| Discovered | 1984 |
Values for superheavy elements are theoretical predictions; none have been measured in bulk.
# Electron configuration of hassium
The electron configuration of hassium is [Rn] 5f¹⁴ 6d⁶ 7s², written out in full as 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f¹⁴ 5s² 5p⁶ 5d¹⁰ 5f¹⁴ 6s² 6p⁶ 6d⁶ 7s². Its 108 electrons fill 7 shells as 2, 8, 18, 32, 32, 14, 2, so the outermost shell holds 2 electrons. Because only a few atoms have ever been made, this configuration is a theoretical prediction.
# Related elements
BhBohriumprevious elementMtMeitneriumnext elementFeIrongroup 8RuRutheniumgroup 8OsOsmiumgroup 8ScScandiumtransition metalTiTitaniumtransition metalVVanadiumtransition metalCrChromiumtransition metalMnManganesetransition metalCoCobalttransition metalNiNickeltransition metalCuCoppertransition metal
# Hassium FAQ
What is the atomic number of hassium?
The atomic number of hassium is 108: every hassium atom has 108 protons in its nucleus. Its symbol is Hs.
What is the atomic mass of hassium?
The standard atomic mass of hassium is [277] u (the mass number of its longest-lived isotope, since it has no stable isotopes).
What is the electron configuration of hassium?
Hassium's electron configuration is [Rn] 5f¹⁴ 6d⁶ 7s² (1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f¹⁴ 5s² 5p⁶ 5d¹⁰ 5f¹⁴ 6s² 6p⁶ 6d⁶ 7s²), with 2, 8, 18, 32, 32, 14, 2 electrons per shell.
Is hassium a metal?
Yes. Hassium is a transition metal, one of the metals.
What is the melting point of hassium?
The melting point of hassium is not known. These values are predictions.
What is hassium used for / known for?
Named after the German state of Hesse, where it was first made.